JP2005230786A - Waste disposal site and impervious layer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the spreading of exuded water at a waste disposal site, regarding a technique of controlling rainwater being impregnated into the waste dumped on a recessed surface for throwing waste away. <P>SOLUTION: A lower impermeable liner 21, a long material 22 arranged in a lattice shape, a self-restoring material 23X having water absorption properties and an upper impermeable liner 24 are arranged on the bottom surface 10A of the recessed surface at the waste disposal site in order from bottom upward. Some time after completion of the above arrangement, the self-restoring layer 23 sags down except the areas supported by the long material 22 and the inner side of the lattice formed by the long materials 22 is depressed. If a breakage 24X occurs with the upper impermeable liner sheet 24 under this condition and also if it rains, the leachate W is collected in that depression and is absorbed by the self-restoring material 23X without spreading. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a technique for suppressing impregnation of rainwater into a waste dumped on a concave surface for dumping waste.

  The waste disposal site has a concave surface provided by digging the ground or constructing a lift wall. Waste is sequentially dumped into this concave surface.

By the way, in a waste disposal site, it is extremely important to prevent leachate generated when rainwater falls on the waste dumped in the concave surface from leaking into the external soil from the concave surface.
The most widely used technique for preventing leakage of leachate is to provide a water shielding layer that covers the entire concave surface. This water shielding layer is made by laying a water shielding sheet over the entire concave surface. Leakage water is prevented from leaking to the outside by laying a water-impervious sheet having a high water-impervious performance made of a synthetic resin impermeable sheet or a rubber impermeable sheet over the entire concave surface.

In recent years, in particular, there has been a high demand for preventing leakage of leachate to the outside. Therefore, a technique of using two sheets of the above-described water-impervious sheets or water absorption between the two water-impervious sheets stacked. A technology for further disposing a highly self-healing material (for example, a mat containing bentonite or a mat-like swelling rubber) has been put into practical use.
The technology that arranges self-healing material between the two water-shielding sheets stacked on top of each other makes it possible to self-heal the leachate that has passed through the damaged part even if the upper water-proofing sheet that touches the waste should be damaged. Since it can be absorbed by the material, it is very excellent in theory.

However, this technique may not work in practice. The reason is as follows.
In a simple structure, the self-healing material is placed between the two water-shielding sheets stacked. The lower water-proofing sheet is placed on the concave surface of the waste disposal site. It is made by executing the process of arranging and then arranging the upper water shielding sheet thereon.
At this time, the self-healing material is in an exposed state after the self-healing material is arranged until the upper water-impervious sheet is arranged. If there is rain in that state, the self-healing material will absorb water and then become useless, so the surface of the self-healing material has a water barrier film that is not so high. It is normal. This film prevents rainwater from reaching the self-healing material in some rain.
With the above-described film, it is certainly possible to avoid the situation where the self-repairing material becomes unusable due to the rain after the self-repairing material is disposed until the upper water shielding sheet is disposed.
However, due to the presence of the film, there is a possibility that the self-healing material cannot sufficiently perform its function in a scene where the function of absorbing water after starting the dumping of waste must be exhibited. With the above-mentioned film, the leachate that has passed through the damaged part of the damaged upper water-proof sheet is the slope on the concave surface of the waste disposal site, the wall of the water-proof sheet or the self-healing material. It is because it spreads along the upper surface of the film stuck on the upper surface of the self-healing material along the unevenness or the like and may not easily reach the self-healing material.
Such diffusion of leachate is not preferable because leachate is present in places other than where the water shielding sheet is damaged.

  This invention solves this subject, and makes it the subject to provide the technique which can prevent the spreading | diffusion of the leachate in the waste disposal site which has a double sheet | seat water shielding sheet in a concave surface.

  The above-described problems are solved by the present invention described below. The present invention is roughly divided into the following first and second inventions.

1st invention is the lower water-impervious sheet | seat which is a sheet | seat which has the concave surface for waste disposal, and was laid on the said concave surface so that at least one part of the said concave surface might be covered, A self-healing layer laid on the lower water-impervious sheet, formed of a plurality of self-healing materials having a water-absorbing mat, and a water-impervious property laid on the self-healing layer A waste disposal site comprising a water shielding layer including an upper water shielding sheet which is a sheet having
A long material is laid between the lower water-impervious sheet of the water-impervious layer and the self-healing layer of the waste disposal site with a predetermined interval.
This waste disposal site includes a water shielding layer including a lower water shielding sheet, a self-healing layer, and an upper water shielding sheet, as in the conventional waste disposal site. In addition, a long material is provided in the water shielding layer. The presence of the long material solves the above-mentioned problem.
When the dumping of the waste starts, the self-healing layer in the water-impervious layer is in a state of being submerged, leaving a portion on the long material due to the weight of the waste. That is, the self-healing layer is in a state in which a portion between the long material and the long material sinks and concave portions are formed in some places.
In this state, if the upper water-impervious sheet is damaged and then rains, rainwater (leached water) that has entered the water-impervious layer from the damaged part of the upper water-impervious sheet will accumulate in the recesses of the self-healing layer. Become. This leachate stays there for a while, so even though it is not so high, even if a film with a water barrier exists on the surface of the self-healing layer, it must penetrate the film and reach the inside of the self-healing layer. Can do. Therefore, in this waste disposal site, the self-healing layer can absorb water without diffusing leachate.

The long material in the first invention may be arranged in any manner on the lower water-impervious sheet. For example, a large number may be laid in parallel, or may be laid in a grid pattern of predetermined eyes. Note that the term “lattice” in this specification includes not only the case where the shape of the eye is a square, but also the case of a rectangle or other polygons.
When the long material is arranged in a lattice shape, the above-described recesses of the self-healing layer can be formed inside the eyes of each lattice. Therefore, rainwater (leached water) that has entered the water-impervious layer from the damaged portion of the upper water-impervious sheet accumulates inside the lattice eye at that position and does not diffuse from there.
The long material in the first invention may have any length and cross-sectional shape as long as it has a certain length or more. The cross-sectional shape of the long material can be, for example, a rectangle, a substantially circular shape, a substantially C shape, a substantially U shape, a substantially L shape, or the like. It can also be hollow. As for the long material, as far as the cross-sectional shape is concerned, it is sufficient that its height is sufficient to form the above-mentioned recess in the self-healing layer.
There is no restriction | limiting in particular about the raw material of the elongate material in 1st invention. For example, the long material can be made of swollen rubber.

The self-healing material in the first invention forms a self-healing layer by placing it on the lower water-impervious sheet. For example, bentonite or highly water-absorbent resin (for example, SAP, which is a derivative of acrylic acid) sandwiched between woven or non-woven fabrics, or a material obtained by forming a swelled rubber into a mat shape is used as a self-healing material. be able to.
Any shape and size of the self-healing material may be used. For example, it can be formed in a rectangular shape. In this case, if the long material is arranged in a lattice shape, the above-described eye can be made to have a size and shape hidden by the rectangular self-healing material.

  1st invention is provided on the said concave surface of the waste disposal site provided with the concave surface for waste dumping, and was laid down so that at least one part of the said concave surface might be covered, A self-healing layer formed by a plurality of self-healing materials that are laid on the lower water-impermeable sheet and have a water-absorbing mat shape, and the self-healing material An upper water-impervious sheet that is a sheet having a water-impervious property laid on the layer, and a predetermined amount between the lower water-impervious sheet and the self-healing layer It also provides a water-impervious layer that is spaced and spaced by long materials.

The second invention is as follows.
The second invention is a lower water-impervious sheet that is provided with a concave surface for dumping waste and that is laid on the concave surface so as to cover at least a part of the concave surface. A self-healing layer laid on the lower water-impervious sheet, formed of a plurality of self-healing materials having a water-absorbing mat, and a water-impervious property laid on the self-healing layer A waste disposal site comprising a water shielding layer including an upper water shielding sheet which is a sheet having And the elongate material formed with the material harder than another part is provided in the said self-repairing layer by the predetermined space | interval.
The waste disposal site according to the second invention includes a water shielding layer including a lower water shielding sheet, a self-healing layer, and an upper water shielding sheet, as in the conventional waste disposal site. In addition, a long material is provided in the self-healing layer of the water shielding layer. The presence of the long material solves the above-mentioned problem.
When the dumping of the waste starts, the self-healing layer in the water-impervious layer is in a state of being submerged by leaving the long material portion by the weight of the waste. That is, the self-healing layer is in a state in which a portion between the long material and the long material sinks and concave portions are formed in some places.
In this state, if the upper water-impervious sheet is damaged and then rains, rainwater (leached water) that has entered the water-impervious layer from the damaged part of the upper water-impervious sheet will accumulate in the recesses of the self-healing layer. Become. As a result, as in the case of the first invention, the self-healing layer can absorb water without diffusing leachate.

The long material in the second invention may be arranged in any manner inside the self-healing layer. For example, a large number of them may be provided in parallel, or may be provided in a grid pattern of predetermined eyes.
When the long material is arranged in a lattice shape, the above-described recesses of the self-healing layer can be formed inside the eyes of each lattice. Therefore, rainwater (leached water) that has entered the water-impervious layer from the damaged portion of the upper water-impervious sheet accumulates inside the lattice eye at that position and does not diffuse from there.
The long material in the second invention may have any length and cross-sectional shape as in the case of the first invention. In the case of the long material of the second invention, as far as the cross-sectional shape is concerned, it is sufficient that its height is sufficient to form the above-mentioned recess in the self-healing layer. For example, the length of the long material in the thickness direction of the self-healing material may be substantially equal to the thickness of the self-healing material.
The long material according to the second aspect of the invention may be arranged so as to be along a peripheral portion of at least a part of the self-healing material. If a large number of such self-healing materials are arranged on the lower water-impervious sheet, the long material can be automatically arranged inside the self-healing layer.
Even in the second invention, there is no particular limitation on the material of the long material. For example, the long material can be made of swollen rubber.

The self-healing material in the second invention can be composed of the same material as in the first invention. In other words, bentonite or a superabsorbent resin (for example, SAP, which is a derivative of acrylic acid) sandwiched between woven or non-woven fabrics, or a swelled rubber molded into a mat is used as a self-healing material. be able to.
The self-healing material in the second invention may have any shape and size. For example, it can be formed in a rectangular shape. In this case, if the long material is arranged in a lattice shape, the above-described eye can be made to have a size and shape hidden by the rectangular self-healing material. In this case, the long material can be arranged along the four sides of the rectangular self-healing material.

  2nd invention is provided on the said concave surface of the waste disposal site provided with the concave surface for waste disposal, and has water-imperviousness laid so as to cover at least a part of the concave surface A lower water-impervious sheet that is a sheet, a self-healing layer that is laid on the lower water-impervious sheet and is formed of a plurality of self-healing materials having a water absorption property, and an upper surface of the self-healing layer And a water-impervious sheet including a water-impervious sheet, which is a sheet having a water-impervious property, and is a long material formed of a material harder than other parts inside the self-healing layer Is also provided at a predetermined interval.

  Note that the water shielding layer according to the first invention and the water shielding layer according to the second invention are not necessarily provided on the entire concave surface. For example, it is possible to provide a water shielding layer according to the first invention of the present application or a water shielding layer according to the second invention on a part of the concave surface, and to provide a conventional water shielding layer on other parts.

  Hereinafter, preferred first and second embodiments of the present invention will be described in detail with reference to the drawings.

<< First Embodiment >>
In this embodiment, a method for constructing a waste disposal site 100 as shown in FIG. 5 by providing a water shielding layer 20 on the concave surface 10 for waste disposal will be described, and finally completed waste. The configuration of the disposal site 100 will be described.

  FIG. 1 shows a concave surface 10 for waste disposal. The concave surface 10 in this embodiment includes a bottom surface 10A that is a flat surface and a slope 10B that is a slope. The concave surface 10 in this embodiment is formed by digging the ground. However, the concave surface 10 is not limited to this, and may be formed by building a lift wall having a predetermined height around the bottom surface. Moreover, the surface of the concave surface 10 is covered with concrete in this embodiment.

First, the lower water-impervious sheet 21 is laid on the concave surface 10 in this embodiment (FIG. 2). The lower water-impervious sheet 21 in this embodiment covers the entire surface of the concave surface 10.
Although the lower water-impervious sheet 21 is not limited to this, in this embodiment, the lower water-impermeable sheet 21 is formed of a resin sheet having a water-impervious performance. In this embodiment, the thickness of the sheet forming the lower water-impervious sheet 21 is 1.5 mm. However, this thickness may be appropriately determined within a range of about 1 to 3 mm. Moreover, the lower water-impervious sheet 21 is formed by connecting a plurality of sheets which are rectangular in this embodiment.

Next, the long material 22 is laid on the lower water-impervious sheet 21.
In this embodiment, the long material 22 is disposed on the lower water-impervious sheet 21 corresponding to the bottom surface 10 </ b> A of the concave surface 10.
In this embodiment, the long material 22 is arranged in parallel in a certain direction with a predetermined interval, and in parallel in a direction perpendicular to that direction with a predetermined interval, Arranged in a grid with rectangular eyes. However, the long material 22 does not necessarily need to be arranged in this manner. For example, the long material 22 may be arranged in parallel in a certain direction with a predetermined interval, and the shape of the eye is a parallelogram. It doesn't matter if it comes to be. FIG. 3 shows a plan view of a part of the portion corresponding to the bottom 10 </ b> A of the concave surface 10 on which the long material 22 is arranged. The size of the grid is not limited to this, but in this embodiment, the long side is 1.5 to 3 m and the short side is 1 to 2 m.
In this embodiment, the long material 22 has a square cross section whose one side is about 1 cm. But the cross-sectional shape of the elongate material 22 can be made into a rectangle, a substantially circular shape, a substantially C shape, a substantially U shape, a substantially L shape, etc., and can also be made hollow. When the cross section is circular, the long material 22 can have a diameter of about 0.5 to 2 cm.
The long material 22 in this embodiment is not necessarily so, but is made of swollen rubber.

Next, a self-healing layer 23 is formed so as to cover the entire surface of the lower water-impervious sheet 21 (FIG. 4). The self-healing layer 23 is formed by laying a large number of self-healing materials 23 </ b> X on the lower water-impervious sheet 21. Note that the self-repairing material 23X is disposed on the long material 22 disposed on the lower water-impervious sheet 21 at the portion corresponding to the bottom surface 10A of the concave surface 10 to be precise.
The self-healing material 23X in this embodiment is such that a highly water-absorbing material is sandwiched between non-woven fabrics, and both exposed surfaces of the non-woven fabric are coated with a film that is not so large in water permeability. More specifically, in this embodiment, Cosmo Variance (trademark) sold by Izumi Co., Ltd. is used as the self-restoring material 23X. Instead of this, as the self-healing material 23X, a super absorbent material sandwiched between woven fabrics, bentonite sandwiched between woven or non-woven fabrics (Bentfix (trademark) sold by Marubeni Tetsugen Co., Ltd., etc.) Alternatively, a swelled rubber formed into a mat shape may be used.
Note that the self-repairing material 23X in this embodiment is rectangular, and the size thereof is large enough to hide the above-mentioned eye made by the long material 22. The self-healing material 23X of this embodiment has such a size that nine eyes (9 by 3 × 3) can be hidden together.

Finally, the upper water-impervious sheet 24 is laid so as to cover the entire surface of the self-healing layer 23 (FIG. 5).
In addition, the upper water-impervious sheet 24 can be the same as the lower water-impervious sheet 21, and this is actually the case in this embodiment.
Thereby, the waste disposal site 100 is completed.

The waste disposal site 100 of this embodiment includes a concave surface 10 and a water shielding layer 20 that covers the concave surface 10.
The portion of the water shielding layer 20 </ b> A corresponding to the bottom surface 10 </ b> A of the concave surface 10 is the portion corresponding to the slope 10 </ b> B of the concave surface 10 by the lower water shielding sheet 21, the long material 22, the self-repairing layer 23, and the upper water shielding sheet 24. The water shielding layer 20 </ b> B is constituted by the lower water shielding sheet 21, the self-repairing layer 23, and the upper water shielding sheet 24.

The enlarged view of the part corresponding to the bottom face 10A of the concave surface 10 of the waste disposal site 100 of this embodiment is shown in FIG.
In the waste disposal site 100 immediately after completion, a portion of the water shielding layer 20A corresponding to the bottom surface 10A is as shown in FIG.
When a certain time has passed in this state, or when waste is dumped on the concave surface 10, the self-healing layer 23 sinks leaving a portion supported by the long material 22 by its own weight or by the weight of the waste. And the state as shown in FIG. At this time, the upper water-impervious sheet 24 also sinks following it.
In this state, when the damage 24X occurs in the upper water-impervious sheet 24 and there is rain, the leachate W passes through the damaged 24X portion and reaches the self-healing layer 23. At this time, in the self-healing layer 23, the depressions are formed in the grid portions surrounded by the long material 22 due to the above-described sinking, so that the leachate W accumulates in the depressions ( FIG. 6 (C)). After a while in this state, the leachate W passes through the above-described film, enters the self-repairing material 23X, and is absorbed by the superabsorbent resin in the self-repairing material 23X. At this time, the leachate W does not diffuse beyond the lattice.

<< Second Embodiment >>
In this embodiment, a method for constructing the waste disposal site 200 by providing the water shielding layer 20 on the concave surface 10 for dumping waste will be described, and the configuration of the finally completed waste disposal site 200 will be described. I will do it. In the description of the second embodiment, the same reference numerals as those in the first embodiment are attached to the same objects as those in the first embodiment, and descriptions overlapping with those in the first embodiment may be omitted.

  Also in the second embodiment, the waste disposal site 200 is constructed by providing the water shielding layer 20 on the concave surface 10 for waste disposal similar to that shown in FIG.

  Also in the second embodiment, first, the lower water-impervious sheet 21 is laid on the concave surface 10 to obtain the state shown in FIG. The lower water-impervious sheet 21 is the same as that of the first embodiment.

Next, a self-healing layer 23 is formed on the lower water-impervious sheet 21. In this embodiment, the self-repair layer 23 is formed so as to cover the entire surface of the lower water-impervious sheet 21 (FIG. 7).
The self-healing layer 23 is formed by laying a large number of self-healing materials 23 on the lower water-impervious sheet 21. In the second embodiment, the self-healing material 23A disposed on the portion corresponding to the bottom surface 10A of the concave surface 10 is different from the self-healing material 23B disposed on the portion corresponding to the slope 10B.
The self-healing material 23B disposed in the portion corresponding to the slope 10B is the same as the self-healing material 23X of the first embodiment. On the other hand, the self-restoring material 23A disposed on the portion corresponding to the bottom surface 10A is as follows.

The self-healing material 23A in this embodiment has a rectangular shape in plan view as shown in FIG. The self-healing material 23 </ b> A includes a rectangular central portion 231 and a long material 232 fixed to the central portion 231 along the four sides of the central portion 231.
The central part 231 is configured similarly to the self-repairing material 23X in the first embodiment. In this embodiment, as shown in the cross-sectional view of FIG. 9, the superabsorbent material 233 is sandwiched between the nonwoven fabrics 234, and both exposed surfaces of the nonwoven fabric 234 are coated with a film 235 that is not so permeable. ing. The central portion 231 can be replaced with an alternative to the self-healing material 23X described in the first embodiment.
The long material 232 can be configured in the same manner as the long material 22 in the first embodiment. In this embodiment, the long material 232 has a rectangular cross-sectional shape as shown in FIG. Although the elongate material 232 is not restricted to this, in this embodiment, it is comprised with the swelling rubber | gum. The length (height) in the thickness direction of the central portion 231 of the long material 232 substantially matches the thickness of the central portion 231.

  The self-healing material 23A as described above is provided on the portion corresponding to the bottom surface 10A of the lower water-impervious sheet 21, and the self-healing material as described above is provided on the portion corresponding to the slope 10B of the lower impermeable sheet 21. The self-healing layer 23 is formed by laying 23B without gaps.

  Thereby, on the part corresponding to the bottom surface 10A of the lower water-impervious sheet 21, as shown in the plan view of FIG. 10, the long material 232 is arranged so as to form a lattice shape having rectangular eyes, And the center part 231 will be in the state arrange | positioned inside.

Finally, the upper water shielding sheet 24 is laid so as to cover the entire surface of the self-healing layer 23 (FIG. 11).
The upper water-impervious sheet 24 can be the same as the lower water-impervious sheet 21 as in the first embodiment, and this is actually the case in this embodiment.
Thereby, the waste disposal site 200 is completed.

The waste disposal site 200 of this embodiment includes a concave surface 10 and a water shielding layer 20 that covers the concave surface 10.
A portion of the water shielding layer 20A corresponding to the bottom surface 10A of the concave surface 10 and a portion of the water shielding layer 20B corresponding to the slope 10B of the concave surface 10 are both a lower water shielding sheet 21, a self-healing layer 23, and an upper water shielding sheet 24. It will be constituted by.
In addition, in the portion of the water shielding layer 20A corresponding to the bottom surface 10A of the concave surface 10, the above-described long material 232 is arranged to run vertically and horizontally so as to form a lattice shape.

FIG. 12 shows an enlarged view of a portion corresponding to the bottom surface 10A of the concave surface 10 of the waste disposal site 200 of this embodiment.
In the waste disposal site 200 immediately after completion, the portion of the water shielding layer 20A corresponding to the bottom surface 10A is as shown in FIG.
When a certain time has passed in this state, or when waste is dumped on the concave surface 10, the portion of the self-healing layer 23 constituted by the central portion 231 is long due to its own weight or due to the weight of the waste. It sinks more than the material 232, and it will be in the state as shown in FIG. At this time, the upper water-impervious sheet 24 also sinks following the central portion 231.
In this state, when the damage 24X occurs in the upper water-impervious sheet 24 and there is rain, leachate passes through the damaged 24X portion and reaches the self-repair layer 23. At this time, in the self-healing layer 23, depressions are formed in the lattice portions surrounded by the long material 232 due to the above-described sinking, and the leachate W accumulates in the depressions ( FIG. 12 (C)). After a while in this state, the leachate W passes through the film 235 described above, enters the self-repairing material 23A, and is absorbed by the superabsorbent material 233 in the central portion 231. At this time, the leachate W does not diffuse beyond the lattice.

<< Modification of Second Embodiment >>
Instead of the self-healing material 23A used in the second embodiment, a hexagonal self-healing material 23C in plan view as shown in FIG. 13 may be used.
Further, instead of the self-healing material 23A used in the second embodiment, a self-healing material 23D as shown in FIG. 14 may be used. This self-healing material 23D has a rectangular shape in plan view (FIG. 14 (A)), as well as the self-healing material 23A, and has a long material 232 therein (FIG. 14 (A)). (B)). The self-healing material 23D is formed by sandwiching the superabsorbent material 233 between the nonwoven fabrics 234 and coating both exposed surfaces of the nonwoven fabric 234 with a film 235 that is not so large in water permeability. The length (height) in the thickness direction is set to substantially match the distance between the nonwoven fabrics 234. In this embodiment, two long materials 232 are embedded along the long side direction of the rectangular self-healing material 23D and two along the short side direction. In this manner, the long material 232 can be embedded in the self-repairing material 23D.

The sectional side view which shows an example of the concave surface where the waste disposal site of 1st Embodiment of this invention is constructed | assembled. The sectional side view which shows the state which laid the lower water-impervious sheet on the concave surface shown in FIG. The top view corresponding to a part of bottom face of a concave surface which shows the state which laid the elongate material on the lower water-impervious sheet corresponding to the bottom face of a concave surface. The sectional side view which shows the state which laid the self-restoration material on the lower water-impervious sheet shown in FIG. 1 is a side sectional view showing a waste disposal site according to a first embodiment. (A) is a side cross-sectional view showing an enlarged bottom surface portion of the concave surface of the waste disposal site of the first embodiment immediately after completion, and (B) is a diagram after waste dumping has started in the waste disposal site. The side sectional view which expands and shows the portion, (C) is the side sectional view which expands and shows the portion in case an upper impervious sheet is damaged and there is rainfall. The sectional side view which shows the state which laid the self-restoration material on the lower water-impervious sheet laid on the concave surface used as the waste disposal site of 2nd Embodiment. The top view which shows what is laid in the part corresponding to the bottom face of a concave surface among the self-repairing materials shown in FIG. Sectional drawing which shows the self-repairing material shown in FIG. The top view of the part corresponding to a part of concave bottom face which shows the state which laid the self-restoration material on the lower water-impervious sheet corresponding to the concave bottom face. The sectional side view which shows the waste disposal site of 2nd Embodiment. (A) is a side sectional view showing an enlarged bottom surface portion of the concave surface of the waste disposal site according to the second embodiment immediately after completion, and (B) is a diagram after waste dumping has started in the waste disposal site. The side sectional view which expands and shows the portion, (C) is the side sectional view which expands and shows the portion in case an upper impervious sheet is damaged and there is rainfall. The top view which shows the modification of what is laid in the part corresponding to the bottom face of a concave surface among the self-repairing materials shown in FIG. (A) is a top view which shows the other modification of what is laid in the part corresponding to the bottom face of a concave surface among the self-repairing materials shown in FIG. 7, (B) is the same sectional drawing.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Concave surface 20 Impermeable layer 21 Lower impermeable sheet 22 Long material 23 Self-healing layer 23X Self-healing material 23A Self-healing material 23B Self-healing material 23C Self-healing material 23D Self-healing material 24 Upper water-impervious sheet 100 Waste disposal site 200 Waste disposal site 231 Central part 232 Long material 233 Superabsorbent material 234 Non-woven fabric 235 Film

Claims (12)

A concave surface for waste disposal, and on the concave surface,
A lower water-impervious sheet that is a sheet having a water-impervious property that is laid so as to cover at least a part of the concave surface, and a plurality of mats having a water-absorbing property that are laid on the lower water-impervious sheet. Waste disposal comprising a water-impervious layer comprising a self-healing layer formed of the self-healing material and an upper water-impervious sheet that is a sheet having a water-impervious property laid on the self-healing layer Where
Between the lower water-impervious sheet and the self-healing layer of the water-impervious layer, a long material is laid with a predetermined interval,
Waste disposal site. The long material is laid in a grid of predetermined eyes,
The waste disposal site according to claim 1. The self-healing material is rectangular, and the eyes are rectangular in size and shape hidden in the rectangular self-healing material,
The waste disposal site according to claim 2. The long material is composed of a swelling rubber,
The waste disposal site according to any one of claims 1 to 3. A concave surface for waste disposal, and on the concave surface,
A lower water-impervious sheet that is a sheet having a water-impervious property that is laid so as to cover at least a part of the concave surface, and a plurality of mats having a water-absorbing property that are laid on the lower water-impervious sheet. Waste disposal comprising a water-impervious layer comprising a self-healing layer formed of the self-healing material and an upper water-impervious sheet that is a sheet having a water-impervious property laid on the self-healing layer Where
Inside the self-healing layer, long materials formed of a material harder than other parts are provided at predetermined intervals.
Waste disposal site. The long material is provided in a grid pattern of predetermined eyes,
The waste disposal site according to claim 5. The long material is composed of a swelling rubber,
The waste disposal site according to claim 5 or 6. The long material is arranged so as to be along a peripheral portion of at least a part of the self-healing material,
The waste disposal site according to claim 5. The self-healing material is rectangular, and the long material is arranged along the four sides of the self-healing material,
The waste disposal site according to claim 5. The length of the long material in the thickness direction of the self-healing material is substantially equal to the thickness of the self-healing material,
The waste disposal site according to claim 8 or 9. It is provided on the concave surface of the waste disposal site with the concave surface for waste disposal,
A lower water-impervious sheet that is a sheet having a water-impervious property that is laid so as to cover at least a part of the concave surface, and a plurality of mats having a water-absorbing property that are laid on the lower water-impervious sheet. A water-impervious layer comprising: a self-healing layer formed of the self-healing material; and an upper water-impervious sheet that is a sheet having a water-impervious property laid on the self-healing layer,
Between the lower water-impervious sheet and the self-healing layer of the water-impervious layer, a long material is laid with a predetermined interval,
Impermeable layer. It is provided on the concave surface of the waste disposal site with the concave surface for waste disposal,
A lower water-impervious sheet that is a sheet having a water-impervious property that is laid so as to cover at least a part of the concave surface, and a plurality of mats having a water-absorbing property that are laid on the lower water-impervious sheet. A water-impervious layer comprising: a self-healing layer formed of the self-healing material; and an upper water-impervious sheet that is a sheet having a water-impervious property laid on the self-healing layer,
Inside the self-healing layer, long materials formed of a material harder than other parts are provided at predetermined intervals.
Impermeable layer.

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